Question about 2004 Ford F350
If the check engine light is on, take the truck to an autoparts store and have them scan the computer for any fault codes that may be stored there. Most parts stores will do the scan for free. I would suspect a faulty idle air control valve or throttle position sensor, but getting the codes should help narrow down the cause of the problem and end speculation. Sure hope this helped and best wishes.
Posted on Jul 30, 2009
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Posted on Jan 02, 2017
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May 26, 2013 | 2000 Ford Mustang
Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.
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